astronomy | M Thomas Apple Author Page

Ah, timely, as usual, Duke Togo

November 22, 2023
MThomas

From the beginning of the Golgo 13 story, 「剥がれた鍍金」(*hagareta tokin*, “The peeled away metal plating”).

Despite the fact that the manga Golgo 13 is about as conservative as you can get (openly misogynistic and racist at times, as well), I’ve been a fan since before coming to Japan in 1999. I hadn’t realized that the original anime movie that I saw back in Boston was based on what became the manga with the most printed volumes in the world in July 2021. This year marks its 50th anniversary, and the stories are being reproduced in larger format, grouped according to physical region.

The group of stories based in Japan came out a short while ago (I already got copies of stories based in France and the Middle East, and a book based in Italy is due soon). Interestingly, one of the stories is reproduced from December 2001 — four months after JAXA successfully launched the H-IIA rocket following a previous failure (hence, the “peeled metal plating” title).

Horned comet approaching Earth soon

October 30, 2023
MThomas

The comet has a core of dust, gas and ice surrounded by a bright cloud of gas known as a coma. Sunlight and solar radiation can heat the comet’s core, sometimes causing violent outbursts like the ones observed in July and Oct.

Herman said the comet’s temporary horns are thought to originate from these icy eruptions. The comet’s structure may be shaping how the spewed clouds of gas and ice appear from Earth, creating the appearance of horns to ground-based telescopes.
https://www.nbcnews.com/science/space/devil-comet-will-bring-horns-swooping-earth-summer-rcna121989

Apparently some astronomers likened the shape to the Millenial Falcon.

I guess they have sharper eyes, bc I don’t see that.

Anyway, Comet 12/P Pons-Brooks only comes once every 71 years, so keep your eyes open next June. It may be visible even without a telescope.

Gateway not to be used until Artemis 4

September 4, 2023
MThomas

ESA image. Gateway is planned to be much smaller and more cramped than ISS (about 1/6 the size).

NASA and its international partners see Gateway as a key platform to support the agency’s Artemis moon program and to build the technology required for future deep-space missions. Although the first elements of the small space station are expected to launch before the Artemis 3 mission lifts off in 2025 or 2026, NASA previously said that those astronauts will not use Gateway to “make that mission have a higher probability of success.”
https://www.space.com/artemis-4-first-astronauts-visit-gateway-moon-space-station

While it’s a good idea to see some planning for this, I think maybe NASA should focus on getting Artemis 1 to work properly before they go on about Artemis 3 and 4.

Taking advantage of Gateway’s orbit far away from Earth’s protective magnetic field, three instruments will study risks due to radiation from the sun and from cosmic rays. Scientists hope this knowledge can help inform future long-term missions to the moon and Mars.

Since Gateway will orbit the Moon and not the Earth, the biggest problem will be preventing astronauts (and instruments!) from getting fried by solar radiation. Scientists need to come up with materials to shield people on Gateway and the Moon, or else we’re going nowhere…

(That said, regolith – soil, basically – has already been proposed and even tested: Llamas et al. (2022). “Effectiveness of Martian regolith as a radiation shield,” Planetary and Space Science, 218, 105517 https://www.sciencedirect.com/science/article/abs/pii/S0032063322001039)

Chandraan-3 rover finds…sulfur on the Moon?

September 1, 2023
MThomas

India’s Moon rover is making tracks…

One main reason for landing at the Moon’s South Pole is that the presence of water would help us build permanent settlements…

This region on the moon is an attractive place for humans to build a lasting presence due to the fact that water ice is located underfoot. Future moon-dwellers can potentially tap into that water for consumption, or even to create rocket propellant, instead of depending on water shipped from Earth.
https://www.space.com/chandrayaan-3-sulfur-surprising-composition-lunar-south-pole-soil

Another reason has now been found…iron, manganese, aluminum, titanium…and “surprisingly” sulfur. Why should they be surprised? It’s already been established that the Moon has ice, and sulfur forms every time hydrocarbon and sulfates combine. Plus sulfur obviously results from volcanic activity, and it’s likely the Moon was volcanic when it first formed. And sulfur is also produced through nuclear fusion – i.e., the Sun.

So what can we do with this knowledge?

Having a more complete chemical composition of the lunar south pole area means future travelers to — and possible inhabitants of — the region can also plan for what else they don’t need to bring from Earth. In particular, some scientists have suggested moon-dwellers could use sulfur in bits of infrastructure such as building materials, solar cells and batteries.

Hmmm…I think more studies are needed first…define “bits,” for example.

New (possibly) interstellar comet on a one-way trip…

August 24, 2023
MThomas

Comet Nishimura’s orbit means that this is likely its first and final trip through the inner solar system. It is possible that the comet originated outside our star system, which would make it the third known interstellar object ever detected, following ‘Oumuamua — which some astronomers speculatively suggested was an alien spacecraft — and Comet 2I/Borisov.
https://www.livescience.com/space/comets/new-potentially-interstellar-comet-will-be-visible-to-the-naked-eye-next-month-before-leaving-our-solar-system-forever

Discovered just two weeks ago by an amateur Japanese astronomer (after whom the comet is now named), the comet Nishimura will approach Earth at its closest on September 13th. But it will be at its brightest about five days later as it approaches the Sun.

Its fate?

Astronomers don’t know when the possible interstellar interloper will depart the solar system. However, it is also possible that the intense force of the comet’s solar slingshot will rip its solid nucleus apart, according to NASA.

Also, its nucleus gives off a “green glow,” which is the result of sunlight breaking apart dicarbon, or diatomic carbon. So getcher geek on, chemical lab rats!

Chandrayaan-3 successfully lands on the Moon!

August 24, 2023
MThomas

Taken just prior to landing…the “image” shown of it actually landing was not real but a simulation.

India and Russia had been locked in a race to the lunar south pole. The Luna-25 spacecraft that crashed was the first moon-landing spacecraft launched by Russia’s space agency in almost five decades. Roscosmos officials said Sunday they lost contact with the lander after it fired its engines in preparation for a descent to the surface.
https://www.nbcnews.com/news/world/india-chandrayaan-3-landing-moon-south-pole-rcna101296

It wasn’t much of a “race,” tbh. India had been planning this for years, while Russia randomly launched a craft that had virtually no chance of succeeding.

Congratulations, ISRO! You should have some company over the next couple of years. Here’s hoping that international cooperation and not competition will lead humanity to permanent settlements on the Moon. Mars, and beyond…

Supermassive black hole found spitting a giant, high-energy jet toward Earth

August 14, 2023
MThomas

A NASA mission has observed a supermassive black hole pointing its highly energetic jet straight toward Earth. Don’t panic just yet, though. As fearsome as this cosmic event is, it’s located at a very safe distance of about 400 million light-years away.
https://www.livescience.com/space/black-holes/supermassive-black-hole-found-spitting-a-giant-high-energy-jet-toward-earth

Gee. So reassuring.

FWIW I had never heard the term “blazar” before reading the linked article.

Sounded like a cross between Happy Days and late 1970s Japanese anime.

And it just so happens there’s a new Ultraman Blazar “live action” on Japanese TV from this past July…

Seriously. It’s called Ultraman Blazar. Honestly, I can’t make this stuff up… (https://www.imdb.com/title/tt27560594/)

“Cosmic unicorn”! Two planets in the same orbit?

August 13, 2023
MThomas

The two planets are in circles that kind of look like, er….let’s just call the whole thing a cosmic donut (the outer “halo” is the protoplanetary disc of gas and dust from which planets eventually coalesce).

We already know that more than one object can share the same orbit; Jupiter has a collection of 120,000 asteroids following its same path around the Sun, for example. Earth has one, too. But although it’s theoretically possible, astronomers have never discovered two whole planets sharing the same orbit around a star before.
https://www.inverse.com/science/astronomers-discover-cosmic-unicorn-two-planets-on-the-same-orbit

Hmm…the language here is a bit misleading. The two objects are technically not both “planets.”

The article comments later on that the object in the dotted line circle is “a cloud of debris about twice the mass of our Moon trailing a bit behind the innermost gas giant” in one of its LaGrange points (where “Trojan” asteroids follow gas giants such as Jupiter and Saturn). So it’s way too early to say that “two” planets formed in the same orbit.

Still, this is the first time that astronomers have spotted two such objects this close to one another in the same orbit. Who knows if both will remain viable (the debris cloud could become partly or mostly absorbed by the gas giant with the rest either being expelled or thrust into separate orbits).

So why is this called a “cosmic unicorn”?

Apparently because although such Trojans “are allowed to exist by theory, but no one has ever detected them.”

Um. OK.

So, like, totally NOT at all like this? Kind of a bummer, really…

Chandrayaan-3 to the Moon!

July 19, 2023
MThomas

I love the helpful explanation about the scale…

“If we want to develop the Moon as an outpost, a gateway to deep space, then we need to carry out many more explorations to see what sort of habitat would we be able to build there with the locally-available material and how will we carry supplies to our people there,” Mr Annadurai says.
https://www.bbc.com/news/world-asia-india-66185565

Chandrayaan-1 was India’s first successful Moon launch in 2008 — it deliberately crashed in order to measure the amount of water at the South Pole.

Chandrayaan-2 was only partly successful, as it did put an orbiter around the Moon, but the rover crashed. (The orbiter is still there, sending back information on a regular basis.)

Now, Chandrayaan-3 aims to finally land a rover and do some research exploring.

Let’s hope they can get it to land safely this time…

Another James Webb discovery: UV actually helps life

July 3, 2023
MThomas

Images of the Orion Nebula, c/o ESA and NASA (it’s complicated…)

For the first time ever, a team of international scientists detected a carbon compound known as methyl cation (pronounced cat-eye-on), or CH₃⁺, in d203-506. CH₃⁺ is significant for understanding how life began on Earth — and how it might develop elsewhere.
https://www.astronomy.com/science/jwst-spots-a-molecule-vital-to-life-in-protoplanetary-disk/

Ultraviolet radiation (UV) is known for destroying complex carbon-based molecules. But could it also provide the energy for them to exist?

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